Bhagavatapurana 12.3.17

12.3.17

yugāni yuga-dharmāṃś ca mānaṃ pralaya-kalpayoḥ /
kālasyeśvara-rūpasya gatiṃ viṣṇor mahātmanaḥ //

17. Pray tell me of the yugas (ages), of the courses of duties peculiar to each, of the extent of Pralaya (deluge) and the period of subsistence and, in short, of the ways of the Omniscient Vishnu, who is in the form of Omnipotent Time.